3 results about "Phase diversity" patented technology

The invention discloses a phase difference wavefront-image estimation method based on depth image prior. The method comprises the following steps: firstly, constructing a forward physical model of an incoherent imaging system, and generating an observation image with out-of-focus aberration by introducing phase difference; and then using a depth image prior network to jointly optimize image domain loss and wavefront domain loss under the condition of no external training data by taking the consistency of an observation image and a model generation image as a constraint so as to simultaneously obtain a high-quality recovered image and accurate wavefront estimation. The method provided by the invention can realize accurate wavefront estimation and high-quality image recovery under the condition of large aberration under the condition of only needing a small number of acquired images, and has the advantages of strong anti-noise capability, no need of an additional wavefront sensor and low system complexity. The method can be widely applied to fluorescence microscopic imaging and other high-resolution microscopic imaging technologies, and the imaging resolution and the image quality are improved.

The invention discloses an intelligent wavefront sensing method based on a single in-focus image. The method comprises the following steps: determining the architecture and learning target of a deep learning model; constructing a training data set of the paired samples; preprocessing and standardizing the data set; training and optimizing the model by using the data set to obtain a deep learning model; inputting the light intensity image into a deep learning model to obtain a wavefront parameter initial prediction result; performing combinatorial optimization on angular even symbols in the initial prediction result; based on the initial prediction result, generating a conjugate wavefront and calculating a far-field light intensity simulation image; and iterating the angle even symbols item by item as the final judgment of the angle even symbols, and restoring the wavefront parameters. According to the invention, the problem of ambiguity of an angle even item symbol is solved, the restoration precision which is not less than that of a double-amplitude phase diversity technology is realized, and the practical process of a single-amplitude wavefront sensing technology is greatly promoted.

The application discloses a kind of simultaneous differential and phase diversity photonic time stretching systems of dual polarization modulation.The system realizes differential modulation by X and Y polarization state in a single dual polarization quadrature amplitude modulator, and realizes phase diversity by using two dual polarization quadrature amplitude modulators respectively arranged at different bias operating points.The system comprises a pulse generation module, a signal modulation module, a polarization separation module and a data processing module.The pulse generation module generates pre-chirped optical pulses.The signal modulation module modulates radio frequency signals, so that the radio frequency signals carried by the X and Y polarization sub-modulators in the two modulators are differential signals.The polarization separation module separates the X and Y polarization states by a polarization beam splitter.The data processing module uses maximum ratio combining algorithm to suppress the power periodic fading caused by dispersion.The present scheme greatly reduces the sampling rate requirement of the backend ADC, and realizes high-fidelity real-time acquisition of ultra-wideband transient signals with low-cost hardware.